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Brief cognitive assessment in schizophrenia: normative data for the Repeatable Battery for the Assessment of
Christopher M Wilk1, James M Gold, Kathy Humber
1Maryland Psychiatric Research Center, PO Box 21247, Baltimore, MD 21228-0747, USA.
Background:
The Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) is a brief, standardized cognitive screening instrument that assesses several domains of interest and offers an efficient approach to screening for cognitive impairment in schizophrenia (SC). Prior studies have established the clinical validity and test-retest reliability of the RBANS in SC.
Aims:
The purpose of the current study was to guide clinical interpretation by providing normative data for the use of the RBANS as a measure of cognitive impairment in SC. We also sought to evaluate the role of demographic factors and to present percentile data accordingly.
Methods:
575 patients (391 male, 184 female) meeting the diagnostic criteria for SC or schizoaffective disorder were recruited from 4 inpatient (n=117) and 6 outpatient (n=458) sites in 2 different mental health treatment systems. All participants were administered the RBANS according to standardized instructions and a subgroup of 242 patients were also administered the Wide Range Achievement Test (3rd Edition) (WRAT-3) Reading subtest.
Results:
RBANS Total Scale score for patients with SC was approximately 2 standard deviations below the normal mean, was approximately 1 standard deviation below WRAT-3 Reading scores, and expected patterns of impairment were observed: measures of language and visuospatial ability were preserved relative to those of memory and attention. Aside from weak associations with Language (0.139) and Attention (0.112), age was not significantly associated with RBANS Index scores (which are age adjusted in healthy controls). Education was significantly associated with all RBANS scores and one-way ANOVA indicates that those with more than high school education scored consistently higher than the other two groups (less than and equal to a complete high school education). Normative tables with age and education based percentiles are presented.
Conclusions:
The RBANS is an efficient screening tool for assessing cognitive impairment in patients with SC thereby making it a useful instrument for clinical and research applications.
